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<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_asio.using"></a><a class="link" href="using.html" title="Using Boost.Asio">Using Boost.Asio</a>
</h2></div></div></div>
<h4>
<a name="boost_asio.using.h0"></a>
      <span><a name="boost_asio.using.supported_platforms"></a></span><a class="link" href="using.html#boost_asio.using.supported_platforms">Supported
      Platforms</a>
    </h4>
<p>
      The following platforms and compilers have been tested:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
          Win32 and Win64 using Visual C++ 7.1 and Visual C++ 8.0.
        </li>
<li class="listitem">
          Win32 using MinGW.
        </li>
<li class="listitem">
          Win32 using Cygwin. (<code class="computeroutput"><span class="identifier">__USE_W32_SOCKETS</span></code>
          must be defined.)
        </li>
<li class="listitem">
          Linux (2.4 or 2.6 kernels) using g++ 3.3 or later.
        </li>
<li class="listitem">
          Solaris using g++ 3.3 or later.
        </li>
<li class="listitem">
          Mac OS X 10.4 using g++ 3.3 or later.
        </li>
</ul></div>
<p>
      The following platforms may also work:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
          AIX 5.3 using XL C/C++ v9.
        </li>
<li class="listitem">
          HP-UX 11i v3 using patched aC++ A.06.14.
        </li>
<li class="listitem">
          QNX Neutrino 6.3 using g++ 3.3 or later.
        </li>
<li class="listitem">
          Solaris using Sun Studio 11 or later.
        </li>
<li class="listitem">
          Tru64 v5.1 using Compaq C++ v7.1.
        </li>
<li class="listitem">
          Win32 using Borland C++ 5.9.2
        </li>
</ul></div>
<h4>
<a name="boost_asio.using.h1"></a>
      <span><a name="boost_asio.using.dependencies"></a></span><a class="link" href="using.html#boost_asio.using.dependencies">Dependencies</a>
    </h4>
<p>
      The following libraries must be available in order to link programs that use
      Boost.Asio:
    </p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
          Boost.System for the <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span></code>
          and <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">system_error</span></code> classes.
        </li>
<li class="listitem">
          Boost.Regex (optional) if you use any of the <a class="link" href="reference/read_until.html" title="read_until"><code class="computeroutput"><span class="identifier">read_until</span><span class="special">()</span></code></a>
          or <a class="link" href="reference/async_read_until.html" title="async_read_until"><code class="computeroutput"><span class="identifier">async_read_until</span><span class="special">()</span></code></a>
          overloads that take a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex</span></code>
          parameter.
        </li>
<li class="listitem">
          <a href="http://www.openssl.org" target="_top">OpenSSL</a> (optional) if you use
          Boost.Asio's SSL support.
        </li>
</ul></div>
<p>
      Furthermore, some of the examples also require the Boost.Thread, Boost.Date_Time
      or Boost.Serialization libraries.
    </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
        With MSVC or Borland C++ you may want to add <code class="computeroutput"><span class="special">-</span><span class="identifier">DBOOST_DATE_TIME_NO_LIB</span></code> and <code class="computeroutput"><span class="special">-</span><span class="identifier">DBOOST_REGEX_NO_LIB</span></code>
        to your project settings to disable autolinking of the Boost.Date_Time and
        Boost.Regex libraries respectively. Alternatively, you may choose to build
        these libraries and link to them.
      </p></td></tr>
</table></div>
<h4>
<a name="boost_asio.using.h2"></a>
      <span><a name="boost_asio.using.building_boost_libraries"></a></span><a class="link" href="using.html#boost_asio.using.building_boost_libraries">Building
      Boost Libraries</a>
    </h4>
<p>
      You may build the subset of Boost libraries required to use Boost.Asio and
      its examples by running the following command from the root of the Boost download
      package:
    </p>
<pre class="programlisting">bjam --with-system --with-thread --with-date_time --with-regex --with-serialization stage
</pre>
<p>
      This assumes that you have already built <code class="computeroutput"><span class="identifier">bjam</span></code>.
      Consult the Boost.Build documentation for more details.
    </p>
<h4>
<a name="boost_asio.using.h3"></a>
      <span><a name="boost_asio.using.optional_separate_compilation"></a></span><a class="link" href="using.html#boost_asio.using.optional_separate_compilation">Optional
      separate compilation</a>
    </h4>
<p>
      By default, Boost.Asio is a header-only library. However, some developers may
      prefer to build Boost.Asio using separately compiled source code. To do this,
      add <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">asio</span><span class="special">/</span><span class="identifier">impl</span><span class="special">/</span><span class="identifier">src</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code> to one (and only one) source file in a
      program, then build the program with <code class="computeroutput"><span class="identifier">BOOST_ASIO_SEPARATE_COMPILATION</span></code>
      defined in the project/compiler settings. Alternatively, <code class="computeroutput"><span class="identifier">BOOST_ASIO_DYN_LINK</span></code>
      may be defined to build a separately-compiled Boost.Asio as part of a shared
      library.
    </p>
<p>
      If using Boost.Asio's SSL support, you will also need to add <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">asio</span><span class="special">/</span><span class="identifier">ssl</span><span class="special">/</span><span class="identifier">impl</span><span class="special">/</span><span class="identifier">src</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span></code>.
    </p>
<h4>
<a name="boost_asio.using.h4"></a>
      <span><a name="boost_asio.using.macros"></a></span><a class="link" href="using.html#boost_asio.using.macros">Macros</a>
    </h4>
<p>
      The macros listed in the table below may be used to control the behaviour of
      Boost.Asio.
    </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
              <p>
                Macro
              </p>
            </th>
<th>
              <p>
                Description
              </p>
            </th>
</tr></thead>
<tbody>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_ENABLE_BUFFER_DEBUGGING</span></code>
              </p>
            </td>
<td>
              <p>
                Enables Boost.Asio's buffer debugging support, which can help identify
                when invalid buffers are used in read or write operations (e.g. if
                a std::string object being written is destroyed before the write
                operation completes).
              </p>
              <p>
                When using Microsoft Visual C++, this macro is defined automatically
                if the compiler's iterator debugging support is enabled, unless
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</span></code>
                has been defined.
              </p>
              <p>
                When using g++, this macro is defined automatically if standard library
                debugging is enabled (<code class="computeroutput"><span class="identifier">_GLIBCXX_DEBUG</span></code>
                is defined), unless <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</span></code>
                has been defined.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_BUFFER_DEBUGGING</span></code>
              </p>
            </td>
<td>
              <p>
                Explictly disables Boost.Asio's buffer debugging support.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_DEV_POLL</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables <code class="literal">/dev/poll</code> support on Solaris,
                forcing the use of a <code class="computeroutput"><span class="identifier">select</span></code>-based
                implementation.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_EPOLL</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables <code class="computeroutput"><span class="identifier">epoll</span></code>
                support on Linux, forcing the use of a <code class="computeroutput"><span class="identifier">select</span></code>-based
                implementation.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_EVENTFD</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables <code class="computeroutput"><span class="identifier">eventfd</span></code>
                support on Linux, forcing the use of a pipe to interrupt blocked
                epoll/select system calls.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_KQUEUE</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables <code class="computeroutput"><span class="identifier">kqueue</span></code>
                support on Mac OS X and BSD variants, forcing the use of a <code class="computeroutput"><span class="identifier">select</span></code>-based implementation.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_IOCP</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables I/O completion ports support on Windows, forcing
                the use of a <code class="computeroutput"><span class="identifier">select</span></code>-based
                implementation.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_DISABLE_THREADS</span></code>
              </p>
            </td>
<td>
              <p>
                Explicitly disables Boost.Asio's threading support, independent of
                whether or not Boost as a whole supports threads.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN</span></code>
              </p>
            </td>
<td>
              <p>
                By default, Boost.Asio will automatically define <code class="computeroutput"><span class="identifier">WIN32_LEAN_AND_MEAN</span></code>
                when compiling for Windows, to minimise the number of Windows SDK
                header files and features that are included. The presence of <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_WIN32_LEAN_AND_MEAN</span></code>
                prevents <code class="computeroutput"><span class="identifier">WIN32_LEAN_AND_MEAN</span></code>
                from being defined.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_NOMINMAX</span></code>
              </p>
            </td>
<td>
              <p>
                By default, Boost.Asio will automatically define <code class="computeroutput"><span class="identifier">NOMINMAX</span></code>
                when compiling for Windows, to suppress the definition of the <code class="computeroutput"><span class="identifier">min</span><span class="special">()</span></code>
                and <code class="computeroutput"><span class="identifier">max</span><span class="special">()</span></code>
                macros. The presence of <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_NOMINMAX</span></code>
                prevents <code class="computeroutput"><span class="identifier">NOMINMAX</span></code>
                from being defined.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_DEFAULT_LINKED_LIBS</span></code>
              </p>
            </td>
<td>
              <p>
                When compiling for Windows using Microsoft Visual C++ or Borland
                C++, Boost.Asio will automatically link in the necessary Windows
                SDK libraries for sockets support (i.e. <code class="literal">ws2_32.lib</code>
                and <code class="literal">mswsock.lib</code>, or <code class="literal">ws2.lib</code>
                when building for Windows CE). The <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_DEFAULT_LINKED_LIBS</span></code>
                macro prevents these libraries from being linked.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_SOCKET_STREAMBUF_MAX_ARITY</span></code>
              </p>
            </td>
<td>
              <p>
                Determines the maximum number of arguments that may be passed to
                the <code class="computeroutput"><span class="identifier">basic_socket_streambuf</span></code>
                class template's <code class="computeroutput"><span class="identifier">connect</span></code>
                member function. Defaults to 5.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_SOCKET_IOSTREAM_MAX_ARITY</span></code>
              </p>
            </td>
<td>
              <p>
                Determines the maximum number of arguments that may be passed to
                the <code class="computeroutput"><span class="identifier">basic_socket_iostream</span></code>
                class template's constructor and <code class="computeroutput"><span class="identifier">connect</span></code>
                member function. Defaults to 5.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_ENABLE_CANCELIO</span></code>
              </p>
            </td>
<td>
              <p>
                Enables use of the <code class="computeroutput"><span class="identifier">CancelIo</span></code>
                function on older versions of Windows. If not enabled, calls to
                <code class="computeroutput"><span class="identifier">cancel</span><span class="special">()</span></code>
                on a socket object will always fail with <code class="computeroutput"><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_not_supported</span></code>
                when run on Windows XP, Windows Server 2003, and earlier versions
                of Windows. When running on Windows Vista, Windows Server 2008, and
                later, the <code class="computeroutput"><span class="identifier">CancelIoEx</span></code>
                function is always used.
              </p>
              <p>
                The <code class="computeroutput"><span class="identifier">CancelIo</span></code> function
                has two issues that should be considered before enabling its use:
              </p>
              <p>
                * It will only cancel asynchronous operations that were initiated
                in the current thread.
              </p>
              <p>
                * It can appear to complete without error, but the request to cancel
                the unfinished operations may be silently ignored by the operating
                system. Whether it works or not seems to depend on the drivers that
                are installed.
              </p>
              <p>
                For portable cancellation, consider using one of the following alternatives:
              </p>
              <p>
                * Disable asio's I/O completion port backend by defining BOOST_ASIO_DISABLE_IOCP.
              </p>
              <p>
                * Use the socket object's close() function to simultaneously cancel
                the outstanding operations and close the socket.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_NO_TYPEID</span></code>
              </p>
            </td>
<td>
              <p>
                Disables uses of the <code class="computeroutput"><span class="keyword">typeid</span></code>
                operator in Boost.Asio. Defined automatically if <code class="computeroutput"><span class="identifier">BOOST_NO_TYPEID</span></code>
                is defined.
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                <code class="computeroutput"><span class="identifier">BOOST_ASIO_HASH_MAP_BUCKETS</span></code>
              </p>
            </td>
<td>
              <p>
                Determines the number of buckets in Boost.Asio's internal <code class="computeroutput"><span class="identifier">hash_map</span></code> objects. The value should
                be a comma separated list of prime numbers, in ascending order. The
                <code class="computeroutput"><span class="identifier">hash_map</span></code> implementation
                will automatically increase the number of buckets as the number of
                elements in the map increases.
              </p>
              <p>
                Some examples:
              </p>
              <p>
                * Defining <code class="computeroutput"><span class="identifier">BOOST_ASIO_HASH_MAP_BUCKETS</span></code>
                to <code class="computeroutput"><span class="number">1021</span></code> means that the
                <code class="computeroutput"><span class="identifier">hash_map</span></code> objects
                will always contain 1021 buckets, irrespective of the number of elements
                in the map.
              </p>
              <p>
                * Defining <code class="computeroutput"><span class="identifier">BOOST_ASIO_HASH_MAP_BUCKETS</span></code>
                to <code class="computeroutput"><span class="number">53</span><span class="special">,</span><span class="number">389</span><span class="special">,</span><span class="number">1543</span></code> means that the <code class="computeroutput"><span class="identifier">hash_map</span></code>
                objects will initially contain 53 buckets. The number of buckets
                will be increased to 389 and then 1543 as elements are added to the
                map.
              </p>
            </td>
</tr>
</tbody>
</table></div>
<h4>
<a name="boost_asio.using.h5"></a>
      <span><a name="boost_asio.using.mailing_list"></a></span><a class="link" href="using.html#boost_asio.using.mailing_list">Mailing
      List</a>
    </h4>
<p>
      A mailing list specifically for Boost.Asio may be found on <a href="http://sourceforge.net/mail/?group_id=122478" target="_top">SourceForge.net</a>.
      Newsgroup access is provided via <a href="http://dir.gmane.org/gmane.comp.lib.boost.asio.user" target="_top">Gmane</a>.
    </p>
<h4>
<a name="boost_asio.using.h6"></a>
      <span><a name="boost_asio.using.wiki"></a></span><a class="link" href="using.html#boost_asio.using.wiki">Wiki</a>
    </h4>
<p>
      Users are encouraged to share examples, tips and FAQs on the Boost.Asio wiki,
      which is located at <a href="http://think-async.com/Asio/" target="_top">http://think-async.com/Asio/</a>.
    </p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
</tr></table>
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